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The IceCube project and its EHE capability

Learn about IceCube's EHE detection capabilities, GZK neutrinos, beyond Standard Model events, advanced physics methods, and future outlook.

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The IceCube project and its EHE capability

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  1. The IceCube projectand its EHE capability Aya Ishihara University of Wisconsin – Madison (for the IceCube collaboration)

  2. Outline

  3. The IceCube Detector IceTop AMANDA 1450m Digital Optical Module 2450m

  4. and more This year’s strings 9 strings and 16 ice-top station have been deployed Toward 80 string km3 detector ~125m AMANDA

  5. GZK Neutrino and Beyond • GZK neutrino • Beyond the Standard Model

  6. Extremely High Energy Neutrino Targets

  7. t t ng EHE Events in the Earth CR • Generally upgoing events are selected • Earth is opaque for EHE neutrino • EHE neutrino events are mostly down-going NOT up-going down-going m EHE n m m,t m North ng m nm up-going nm > PeV nm <1PeV

  8. EHE Events in Ice GZK neutrino induced lepton and atmospheric muon fluxes at the IceCube depth EGZK >> EAtmm

  9. e+e- p e+e- photo-nuclear m g pair-creation bremsstrahlung EHE Events with the IceCube • Muon energy losses by radiation cascading dE/dx propto E

  10. Muon Events m m m 9 EeV 100 TeV m

  11. MC Setup • Benchmarking models • GZK muons and tau signals • Atmospheric muon background

  12. NPE • Explain Waveforms and NPE just an integral of all the arrival phot-electron • In-ice particle energy dependent, No timing/geometrical information

  13. Another factor to NPE Events with the same energy ~ 30PeV contained High npe: 10^7 npe uncontained Low npe: 1000 npe

  14. t m GZK m Atmospheric m GZK t NPE Distributions

  15. Zenith Distributions Zenith angle GZK m GZK t Atmospheric m down up

  16. Signal Cuts GZK m Atmospheric m

  17. Event Rate 80 strings GZK m GZK t Atmospheric m GZK m GZK t Atmospheric m GZK m3.5events/year GZK t0.56events/year Atmospheric m0.33events/year

  18. Event Rate 9 strings and more GZK m Atmospheric m • With the same cut for all the string numbers GZK m string numbers 9 20 40 60 80 Atmospheric m

  19. 80 strings up-going horizontal down-going Effective Area 1010 GeV 80 S 9 S 108 GeV up-going horizontal down-going

  20. Energy Calibration • Absolutely calibrated photon source (standard-candle) and receivers (golden-dom) SC s40 GD s39

  21. Standard Candle

  22. CR m m IceTop: Background Tagging • Major background is atmospheric muon of which in-ice nature still unknown at this regime • Tagging on the surface muons with surface array for an additional information EHE n m,t

  23. Conclusion -outlook- • IceCube is capable of EHE and the capability is glowing year-by-year • EHE event selection can be done only using amount of photon emitted / received • For reconstruction of further uncontained events, energy/geo, more sophisticated methods using information of photon propagation in ice, e.g. arrival timings, geometrical distributions reflected in waveforms • subsystems

  24. Extra slids

  25. Timing/Geometry • In-ice in-DOM flasher

  26. Effective Area 9 strings and more up-going horizontal down-going

  27. 3km deep ice at South Polevery clear below 1450m depth IceCubeunder construction AMANDA-IICompleted in 2000

  28. The IceCube collaboration

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